This pulls down the license files for all active license types to thirdparty/licenses and builds a thirdparty/licenses/thirdparty-licenses.xml xref that is similar to what we had before.

Additional xrefs that would be useful are: - artifact-users.xml : for every single artificat in thirdparty, list the components that reference it. - component-artifacts.xml : for every component, provide a complete list of its artifacts including imported artifacts.